AreaChart:With steps, fmt and labels

Build 1203 on 2131-clean-up-stories-to-fully-enable-chromatic
1200px
Reviewing disabled
Baseline History
Build 1203312f3b3
Current build. There are unaccepted changes, so build 996 is still the baseline.
Build 996a35ebc4 current baseline
Accepted by Zach Stence.
Build 927c24f8ad
Accepted by Archie Sarre Wood.
Build 85522c35f6
Accepted by Zach Stence.
Build 852bab0b35
Accepted by Zach Stence.
Commenting is disabled because there's a newer build on this branch